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United States Patent | 5,695,518 |
Laerum | December 9, 1997 |
A filtering device and method of preventing embolism and/or the distension of blood vessel walls is provided. The device can be easily put in place and can also be removed from the patient. The device comprises a spring-like active part and a rectilinear actuator. The actuator is used to prolongate or activate the active part. The active part has a shape memory corresponding to the shape of a spiral or a semi-circle. The active part can be straightened and will regain its shape memory position upon installation in the patient's vein. The filter can be used on blood vessels of various sizes because the user can vary the amount of the active part regains its original configuration in the vein. The filter can be secured into place and has the advantage of being removable when no longer needed.
Inventors: | Laerum; Frode (Ovre Ullern, Terasse 17, NO-0380 Oslo 3, NO) |
Appl. No.: | 418618 |
Filed: | April 7, 1995 |
Dec 28, 1990[FR] | 90 16516 | |
Dec 27, 1991[WO] | PCT/FR91/01076 |
Current U.S. Class: | 606/200; 604/60; 606/195; 606/198 |
Intern'l Class: | A61B 017/00; A61F 002/02; A61M 025/00 |
Field of Search: | 606/195,198,200 604/57,59,860 128/899 623/1,12 267/156,272 368/140 |
1710576 | Apr., 1929 | Guett | 267/156. |
3590816 | Jul., 1971 | Rose | 604/60. |
4553545 | Nov., 1985 | Maass et al. | 606/198. |
4834725 | May., 1989 | Iwatschenko | 604/281. |
4957501 | Sep., 1990 | Lahille et al. | 606/200. |
4994069 | Feb., 1991 | Ritchart et al. | 606/200. |
5217484 | Jun., 1993 | Marks | 606/200. |
Foreign Patent Documents | |||
0 201 466 | Nov., 1986 | EP. | |
2 541 901 | Sep., 1984 | FR. | |
2 645 731 | Oct., 1990 | FR. | |
32 03 410 | Nov., 1982 | DE. |
Laerum et al., "In Vitro Function of the Temporary Venous Spring-Filter Compared to Filcard Temporary Filter and Greenfield Vena Cava Filter", Feb. 24, 1995. Laerum et al., "In Vitro Assessment of the New Adjustable Temporary Venous Spring-Filter", Feb. 26, 1995. The Wm. D. Gibson Company, Catalogue No. 9, Springs, Chicago, IL, 1923, pp. 30-31. Barnes-Gibson-Raymond, Division of Associated Spring Corporation, Mechanical Springs, Their Engineering Design, Detroit, MI, 1948, pp. 82-84. Chironis, Spring Design and Application, McGraw-Hill Book Co., Inc., 1961, pp. 36-37. |